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Commit 8c79bfa5 authored by David S. Miller's avatar David S. Miller
Browse files

sparc64: Add hypervisor interfaces for SPARC-T4 perf counter access. 



Unlike for previous chips, access to the perf-counter control
registers are all hyper-privileged.  Therefore, access to them must go
through a hypervisor interface.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6f859c0e

arch/sparc/include/asm/hypervisor.h

+11 −0
Original line number Diff line number Diff line
@@ -2934,6 +2934,16 @@ extern unsigned long sun4v_reboot_data_set(unsigned long ra, 
					   unsigned long len);

#endif



#define HV_FAST_VT_GET_PERFREG		0x184

#define HV_FAST_VT_SET_PERFREG		0x185



#ifndef __ASSEMBLY__

extern unsigned long sun4v_vt_get_perfreg(unsigned long reg_num,

					  unsigned long *reg_val);

extern unsigned long sun4v_vt_set_perfreg(unsigned long reg_num,

					  unsigned long reg_val);

#endif



/* Function numbers for HV_CORE_TRAP.  */

#define HV_CORE_SET_VER			0x00

#define HV_CORE_PUTCHAR			0x01
@@ -2964,6 +2974,7 @@ extern unsigned long sun4v_reboot_data_set(unsigned long ra, 
#define HV_GRP_NIU			0x0204

#define HV_GRP_VF_CPU			0x0205

#define HV_GRP_KT_CPU			0x0209

#define HV_GRP_VT_CPU			0x020c

#define HV_GRP_DIAG			0x0300



#ifndef __ASSEMBLY__

arch/sparc/kernel/hvapi.c

+1 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ static struct api_info api_table[] = { 
	{ .group = HV_GRP_NIU,					},

	{ .group = HV_GRP_VF_CPU,				},

	{ .group = HV_GRP_KT_CPU,				},

	{ .group = HV_GRP_VT_CPU,				},

	{ .group = HV_GRP_DIAG,		.flags = FLAG_PRE_API	},

};

arch/sparc/kernel/hvcalls.S

+16 −0
Original line number Diff line number Diff line
@@ -805,3 +805,19 @@ ENTRY(sun4v_reboot_data_set) 
	retl

	 nop

ENDPROC(sun4v_reboot_data_set)



ENTRY(sun4v_vt_get_perfreg)

	mov	%o1, %o4

	mov	HV_FAST_VT_GET_PERFREG, %o5

	ta	HV_FAST_TRAP

	stx	%o1, [%o4]

	retl

	 nop

ENDPROC(sun4v_vt_get_perfreg)



ENTRY(sun4v_vt_set_perfreg)

	mov	HV_FAST_VT_SET_PERFREG, %o5

	ta	HV_FAST_TRAP

	retl

	 nop

ENDPROC(sun4v_vt_set_perfreg)